Suppressing Second-Trace Echoes; F1] Key - Furuno FR-1500 MARK-3 Series User Manual

1.31 Suppressing Second-trace Echoes

In certain situations, echoes from very distant targets may appear as false echoes (second-trace
echoes) on the screen. This occurs when the return echo is received one transmission cycle later,
that is, after a next radar pulse has been transmitted.
To activate or deactivate the second-trace echo rejector:
1. Press the [MENU] key followed by the [5] key twice to display the ECHO SIG menu.
ECHO SIG
1. COLOR
2. CLTR SWEEP
3. SWEEP LEVEL
4. ENHANCE
ND
5. 2 ECHO
6. PULSE 1
7. PULSE 2
8. A/D CURVE
9. CNTR ENHANCE
0. REALTIME HU
2. Press the [5] key to select OFF or ON.
3. Press the [ENTER/SELECT] key to conclude your selection followed by the [MENU] key to
close the menu.

1.32 [F1] Key

The [F1] key allows instant access to the primary function controls.
1. Press the [F1] key. The following menu appears.
1. VECTOR
2. PULSE
3. INT REJ
4. STRETCH
5. ECHO AVG
6. CONTRAST
7. N REJ
8. DISP SEL
9. PM
0. SART
2. Press appropriate numeric key. For example, press the [4] key to select desired echo
stretch level. Each press of the [4] key selects echo stretch level.
YEL GRN *
OFF ON (LINK) ON(FIX)
1 2 3
OFF ON
OFF ON
A B C D
OFF ON
OFF ON
T/R Vector mode: True or Relative. Press [F1], [1].
Pulselength selection
Interference rejector; Ref. 1.17.
Echo stretch; Ref. 1.36.
Echo average; Ref. 1.24.
Contrast of video; Ref. 1.36.
Noise rejector; Ref. 1.38.
[ENTER/SELECT] toggles display between Main and Sub.
Activates Performance Monitor. Refer to Chapter 7.
Optimum setting for detecting SART; Refer to 3.3.
* COLOR additional to R-type
(8. R-type only)
(9. R-type only)
(0. R-type only)
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